Hmm that doesn't sound like something Google would do...
When you have a new account, they give you $50 credit... your card on file gets charged if you reach that amount or after 30 days of opening the account.
(After that, your credit increases from $50 to $100 and the same thing happens... you pay it if you spend $100 in ads or after 30 days... And then your credit increases to $250, i think, etc... I think the credit they give you maxes out at $500)
Have you, maybe, accumulated $55 worth of clicks from the first 2 campaigns? Maybe it was a coincidence that you reached $50 in ad spend or it has been 30 days since you opened your account, so you were charged the fee right after you started your third campaign.
I am not sure if I am making any sense, but I hope you get what I mean.
adwords charged me $55 for no clicks?
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